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Jinho Choi - One of the best experts on this subject based on the ideXlab platform.

  • Pilot Signal design for compressive sensing based random access in machine type communications
    Wireless Communications and Networking Conference, 2017
    Co-Authors: Kyungjun Lee, Jinho Choi
    Abstract:

    In machine-type communications (MTC), a number of devices are present in a cell, but only a few of them attempt to access by sending preambles or Pilots. For the sparse activity of devices, compressive sensing (CS) can be applied for joint detection of active devices and estimation of channel profiles. In this paper, a theoretical connection between Pilots and the coherence of a CS measurement matrix is revealed for CS-based detection and estimation. Then, the Zadoff-Chu (ZC) and the power residue (PR) sequences are studied as potential candidates for Pilot Signals in CS-based random access. It is also shown that the CS measurement matrices from the ZC- and the PR-based Pilots have theoretically bounded low coherence, which presents a theoretical guarantee of reliable recovery performance. Simulation results demonstrate that the proposed deterministic Pilots outperform random binary and complex-valued Pilots for CS-based random access in MTC.

  • WCNC - Pilot Signal Design for Compressive Sensing Based Random Access in Machine-Type Communications
    2017 IEEE Wireless Communications and Networking Conference (WCNC), 2017
    Co-Authors: Kyungjun Lee, Jinho Choi
    Abstract:

    In machine-type communications (MTC), a number of devices are present in a cell, but only a few of them attempt to access by sending preambles or Pilots. For the sparse activity of devices, compressive sensing (CS) can be applied for joint detection of active devices and estimation of channel profiles. In this paper, a theoretical connection between Pilots and the coherence of a CS measurement matrix is revealed for CS-based detection and estimation. Then, the Zadoff-Chu (ZC) and the power residue (PR) sequences are studied as potential candidates for Pilot Signals in CS-based random access. It is also shown that the CS measurement matrices from the ZC- and the PR-based Pilots have theoretically bounded low coherence, which presents a theoretical guarantee of reliable recovery performance. Simulation results demonstrate that the proposed deterministic Pilots outperform random binary and complex-valued Pilots for CS-based random access in MTC.

Kyungjun Lee - One of the best experts on this subject based on the ideXlab platform.

  • Pilot Signal design for compressive sensing based random access in machine type communications
    Wireless Communications and Networking Conference, 2017
    Co-Authors: Kyungjun Lee, Jinho Choi
    Abstract:

    In machine-type communications (MTC), a number of devices are present in a cell, but only a few of them attempt to access by sending preambles or Pilots. For the sparse activity of devices, compressive sensing (CS) can be applied for joint detection of active devices and estimation of channel profiles. In this paper, a theoretical connection between Pilots and the coherence of a CS measurement matrix is revealed for CS-based detection and estimation. Then, the Zadoff-Chu (ZC) and the power residue (PR) sequences are studied as potential candidates for Pilot Signals in CS-based random access. It is also shown that the CS measurement matrices from the ZC- and the PR-based Pilots have theoretically bounded low coherence, which presents a theoretical guarantee of reliable recovery performance. Simulation results demonstrate that the proposed deterministic Pilots outperform random binary and complex-valued Pilots for CS-based random access in MTC.

  • WCNC - Pilot Signal Design for Compressive Sensing Based Random Access in Machine-Type Communications
    2017 IEEE Wireless Communications and Networking Conference (WCNC), 2017
    Co-Authors: Kyungjun Lee, Jinho Choi
    Abstract:

    In machine-type communications (MTC), a number of devices are present in a cell, but only a few of them attempt to access by sending preambles or Pilots. For the sparse activity of devices, compressive sensing (CS) can be applied for joint detection of active devices and estimation of channel profiles. In this paper, a theoretical connection between Pilots and the coherence of a CS measurement matrix is revealed for CS-based detection and estimation. Then, the Zadoff-Chu (ZC) and the power residue (PR) sequences are studied as potential candidates for Pilot Signals in CS-based random access. It is also shown that the CS measurement matrices from the ZC- and the PR-based Pilots have theoretically bounded low coherence, which presents a theoretical guarantee of reliable recovery performance. Simulation results demonstrate that the proposed deterministic Pilots outperform random binary and complex-valued Pilots for CS-based random access in MTC.

M Yoo - One of the best experts on this subject based on the ideXlab platform.

  • TDOA-based indoor positioning using visible light
    Photonic Network Communications, 2014
    Co-Authors: T H Do, M Yoo
    Abstract:

    In this paper, we propose an indoor positioning system in which the visible light radiated from LEDs is used to locate the position of receiver. Compared to current indoor positioning systems using LED light, our system has the advantages of simple implementation, low cost, and high accuracy. In our system, a single photo diode receives Pilot Signals from LED panels on the ceiling. Then, the time differences of arrival of these Pilot Signals are used to estimate the position of the receiver. The system can be employed easily because it does not require embedding any ID to the Pilot Signal. In the paper, the estimation accuracy of the proposed system is analyzed through the simulation. The causes of estimation error are analyzed, and the estimation accuracy of the system in various conditions is shown by simulations.

  • ICITCS - VLC-TDOA Using Sinusoidal Pilot Signal
    2013 International Conference on IT Convergence and Security (ICITCS), 2013
    Co-Authors: Youngsuk Kim, Yoan Shin, M Yoo
    Abstract:

    In this paper, we propose an indoor visible light positioning system which is based on time difference of arrival (TDOA). Compared to current TDOA which uses square wave for Pilot Signal, our system uses sinusoidal wave for Pilot Signal. Our proposed system is simulated in the room measuring 5×5×3m3. In the simulations, we consider the effects shot noise, thermal noise and noise from reflected light. The simulation results show that the estimation accuracy is 68.2cm on average with using 10ns sampling and with consideration of rising time of LED and PD.

  • the analysis on positioning error of recognition schemes of Pilot Signal in indoor tdoa positioning system using visible light communication
    The Journal of Korean Institute of Communications and Information Sciences, 2012
    Co-Authors: Junho Hwang, M Yoo
    Abstract:

    The visible light communication is considered as a next generation communication technology, when utilizes LED and PD for communication. Since it is easy to provide LOS communication environment along with cheap deployment cost, the positioning system based on VLC has been actively studied. However, the existing positioning system using VLC requires a complex computation and an additional deployment cost due to sensors for example. In this paper, we propose a new positioning system based on VLC which does not require additional complexity and the cost. In addition, the procedure for operating LED panels for positioning and the recognition schemes of Pilot Signal are proposed. The performance of recognition schemes of Pilot Signal is analyzed through the computer simulations.

Norifumi Kamiya - One of the best experts on this subject based on the ideXlab platform.

  • performance of fde using cyclic shifted cdm based Pilot Signal multiplexing for single carrier los mimo
    Vehicular Technology Conference, 2019
    Co-Authors: Kana Aono, Bin Zheng, Mamoru Sawahashi, Norifumi Kamiya
    Abstract:

    This paper presents the bit error rate (BER) performance of frequency domain equalization (FDE) using cyclic-shifted code division multiplexing (CDM) Pilot Signals for single-carrier line-of- sight (LOS) - multiple-input multiple-output (MIMO) multiplexing. We use different cyclic-shift resources of the same Zadoff-Chu sequence for transmission-stream-specific Pilot Signals that are essential for estimating the channel response for FDE and phase noise in LOS-MIMO. Computer simulation results show that the required received Signal-to-noise power ratio satisfying the BER of 10^(-4) by averaging approximately 4 channel responses after despreading the Pilot Signal in the frequency domain is decreased by approximately 2.0 dB compared to that without averaging of the channel response for 256QAM, 1024QAM, and 4096QAM in 2x2 and 4x4 LOS-MIMO. Through the simulation results, we show that CDM-based Pilot Signal multiplexing with different cyclic shifts and the frequency domain averaging of the estimated channel response are effective in achieving accurate channel estimation with a short delay and a low Pilot-overhead loss for single-carrier LOS- MIMO.

  • VTC-Fall - Performance of FDE Using Cyclic-Shifted CDM Based Pilot Signal Multiplexing for Single-Carrier LOS-MIMO
    2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall), 2019
    Co-Authors: Kana Aono, Bin Zheng, Mamoru Sawahashi, Norifumi Kamiya
    Abstract:

    This paper presents the bit error rate (BER) performance of frequency domain equalization (FDE) using cyclic-shifted code division multiplexing (CDM) Pilot Signals for single-carrier line-of- sight (LOS) - multiple-input multiple-output (MIMO) multiplexing. We use different cyclic-shift resources of the same Zadoff-Chu sequence for transmission-stream-specific Pilot Signals that are essential for estimating the channel response for FDE and phase noise in LOS-MIMO. Computer simulation results show that the required received Signal-to-noise power ratio satisfying the BER of 10^(-4) by averaging approximately 4 channel responses after despreading the Pilot Signal in the frequency domain is decreased by approximately 2.0 dB compared to that without averaging of the channel response for 256QAM, 1024QAM, and 4096QAM in 2x2 and 4x4 LOS-MIMO. Through the simulation results, we show that CDM-based Pilot Signal multiplexing with different cyclic shifts and the frequency domain averaging of the estimated channel response are effective in achieving accurate channel estimation with a short delay and a low Pilot-overhead loss for single-carrier LOS- MIMO.

Kamran Ayub - One of the best experts on this subject based on the ideXlab platform.

  • NTMS - IR-UWB Radio Architecture for Wireless Sensors Network Based on Pilot Signal Assisted MAC
    2014 6th International Conference on New Technologies Mobility and Security (NTMS), 2014
    Co-Authors: Kamran Ayub
    Abstract:

    Due to low power consumption and strength to multipath fading Impulse Radio-UWB is an excellent platform for the short-range wireless communication. One of the most promising Radio architecture for impulse radio based communications is RAKE. But as RAKE requires CSI (Channel State Information) for the Signal processing (which consumes extra energy), it is not an ideal choice for Wireless Sensor Network. In this research we have proposed light weight UWB Radio architecture specifically for WSN. We have compared its performance with the traditional RAKE architecture and results show that our proposed architecture well suits to Wireless Sensors Network and works better than RAKE for indoor short range UWB based WSN applications. Our suggested architecture was tested with Pilot Signal Assisted MAC (medium access control) algorithm and is found very well-matched with WSN's MAC needs.

  • Pilot Signal assisted Ultra Wideband medium access control algorithm for Wireless Sensor Networks
    2013 21st Telecommunications Forum Telfor (TELFOR), 2013
    Co-Authors: Kamran Ayub, Valerijs Zagurskis
    Abstract:

    Due to low-power transmission and robustness to multipath fading, Ultra Wideband at Physical layer is an ideal platform for WSN applications, but for the effective use: compatibility with MAC Layer is a challenge. In this paper we have proposed a compatible MAC technique, which well fits with the ultra-wideband and works well for in-door WSN-applications. The aim of research is to enhance the Network throughput and reliability by scheduling mechanism. Our algorithm proposes a relatively new concept of Pilot Signal assisted synchronization that uses intelligent scheduling and consumes very low power. The possible application areas are indoor short range dense multipath environments.